On Monday, one fourth grader sold marijuana to three other fourth graders for $11.

The next day, one of the same fourth graders brought an edible to the fourth grader who sold the pot.

And he ate the candy-bar-looking cannabis.

“He did not get sick. He said he did not feel the effects,” says John Gates, the school district’s director of school safety.

But the two incidents do make education officials feel a little queasy.

“The more troubling aspect to me, than the fact we had pot on an elementary campus yesterday, is both students procured their marijuana from their grandparents,” says Gates.

He says adults need to do a better job of locking up the drug, like they would prescription pills or a firearm.

Anderson agrees. “My four-year-old is not going to know the difference between a candy bar that says Snickers or pot or whatever. So, that’s an issue. That’s up to parents, if they purchase a product, they need to keep it out of the reach of children,” says Anderson.

Other parents say they never dreamed having to tell their younger kids the three R’s of reading, ‘riting and ‘rithmetic do not include a fourth: reefer.

“I never thought I would have to talk to him about it now,” says Britny Smith about her second grader.

The school principal sent out a letter to parents Tuesday saying adults now have greater access to marijuana because of legalizations—but it also means children could have greater access too.

Greeley Police could have charged the 10-year-olds with a crime, but the department is letting the school handle it.